Rory McIlroy walked off PGA National less than halfway through Friday's second round of the Honda Classic in Palm Beach Gardens, Fla., citing a sore wisdom tooth and mental strain.
The world's No. 1 player had played eight holes in 7 over and put an approach shot in the water on No. 18, his ninth hole of the day.
He told playing partners Ernie Els and Mark Wilson, "Here's my card. I'm out of here." On his way off the course, he told several reporters, "I'm not in a good place mentally, you know?"
McIlroy, who's struggled this season using Nike equipment, shot an even-par 70 on Thursday.
Tiger Woods made the cut on the number after posting a second straight 70.
Luke Guthrie had a 7-under 63 for a 9-under 131 and a one-shot lead on Michael Thompson. Camilo Villegas went from first-to-worst. He followed his opening 64 with a 77 and missed the cut.
Joe Flacco and Baltimore reached a tentative agreement on a new
If the deal is completed, the quarterback will receive in excess of $120 million over six years, according to a source. Flacco made $6.76 million last season.
Dodgers outfielder Carl Crawford could miss the April 1 opener against the Giants after leaving spring training to have his surgically repaired elbow examined in Los Angeles.
Tomas Berdych upset Roger Federer 3-6, 7-6 (8), 6-4 to reach the final of the Dubai Championships against Novak Djokovic, who beat Juan Martin del Potro 6-3, 7-6 (4).
Mark Martin, 54, won the pole for Sunday's NASCAR Sprint Cup race at Phoenix International Speedway.
Kasey Kahne will also start on the front row at the mile oval. Daytona 500 winner Jimmie Johnson qualified third, while Danica Patrick will start 40th.
Houston Dynamo forward Brian Ching will serve as a player and assistant coach in his final season before retiring.
The Associated Press contributed to this report.